Track stirrup



FIG. 1 is a bottom right side and front perspective view of a track stirrup showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevation thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation thereof;

FIG. 6 is a bottom left side and front perspective view of a modified form of a track stirrup showing my new design. 

The ornamental design for a track stirrup, as shown and described. 